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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a14f392b9697a70c5fec70436e18f1c3599c199e63690e2be1c375ad6deb63' 
  AND token = '2Tnguw6BXjkg0x0S9CH3vhMvbfvUScLmXE3fWyguVrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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