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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2924ead7d5f23b0ea77fcfa9195740567e4d5475bef64b8f6f0d4423e359c8' 
  AND token = 'skoqtLZQu0q2mYMh53IWY2rzxFqDCnq1MMw4YU8x+2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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