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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb2c837f2b26cd18c161c075cf04224a04bf419a5e89c0116a8ddd60b2b3e5a' 
  AND token = 'bOgNqCz64a58cZOBDOuIex+QB6EmGlfXUA6rwXz3p08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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