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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8852cbc8e2353721f1b425514c017917fe127f668339edad2119401d9b6827bd' 
  AND token = 'sQk69jKb3mOhrNobPKT3y4vEYsFBaNxiy1CizMdn7YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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