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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8794931d9590e2a9b4826b30c32f77c5114c01ef91fbb1b48ff3746bb1a22e' 
  AND token = '7DGjYVgz99StVpNAREjd5g5yCNtCge5/5uoteCZRUFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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