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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c557e2e13058daff7e05fff72b90760c0234c16653ed976b3c0d434e2e628c97' 
  AND token = 'le1S9Olz1PEll4szvNLTLEMEdx1oaVleQhGn2jZ2l+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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