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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704bba833a3dda5744ca7133a5fd9170f571829b29789cf15f424f277c87884c' 
  AND token = 'hlVaexq2k+DPsE1uDTvcfmHEH5KEqBINPyI3VesBYJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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