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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1f054153b8349a96392a9f8e46057ebbe561a8e02b3eb4f47d8ef7623a9a7a' 
  AND token = 'YJOOaePHl6t5yW3jOrgC8EtOA36KP3mszBjjttAuf4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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