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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82c8909f977070964fd4893526184907316371f24c87f222e15d213e02e4786' 
  AND token = 'Fl3hkdQ4dl2zo8nMQjRZsGuRynfXkLPtp4AWnoByH8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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