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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52831ab3360197292207520d3a6afaa94b87bd5d805b69e8ab60b9eee7e3ecc' 
  AND token = 'tkMfxSA36KEg+F8abuvIIC0p9I+goLySrRdAEuGJm2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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