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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89e618e860cfdb870d56b88b4d51804bd36275bdb0d840969aeb5a0ad830236' 
  AND token = 'h0HW2vsrNHPcf4bQBGSnj1Y+0XZ+uHB+G17mx/st37A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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