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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5530c706c97f2a6aeb57ea8005078a37432ed8ca3a4a69c0bce084a61ec7eec' 
  AND token = 'LHwNoH4JaSUz7BFt4TvfL+D7dH1PXCiOCc7SFJ4955Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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