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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016898bd0330acf66549078f745c9b88451d6a7e030237a3227eb71d30fe18a0' 
  AND token = 'hv9ph8PQH8mKyRDWVot2hvy0NYrm42JYUr6mroXQbf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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