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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c299552dee6ef5bece8c1703a1540efd08cca636c3111ffd972535a188b9e3a4' 
  AND token = 'pEVR8WZc0v7TuN9d4z3sLzX15kTyp9Fbm2+UxoGeKwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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