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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d7a24a434c22fd358f219aae2008a9fc7ad0e31c672f8a9db18ff8fd941992' 
  AND token = '/MNTQFqUnw4WWOBRslNy7uWyQP4qATzl8hj7ULmq43A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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