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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57c07dc6552d0645cac0602c02e86313ff8f1665e8a5c1cf5b31fcfaa361c10' 
  AND token = 'LU3LDCR80bPURz7e58WrqP6kqHu+i5KhoBpmyBMtnV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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