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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3a514bab30df9dbe19ac66ffbee139ecf47833b6244c6dfe1ca73c52cffdb9' 
  AND token = 'bIh2G6kAIeaqxJ8breVOBhCw2Oipe8mbUdIcpeUd0Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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