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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f8022626d3e134a24a7ea42e280376cd6fb6790a63a7d3c631c68159621e27' 
  AND token = 'q3axUnxjIFtAH5Rj44gVmTjkKJYyrhG6WT4v9E4yxA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}