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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad372cb891f6472ce4ce37825c311c93bc2fc56693dcefad07207bcb5d1ca10' 
  AND token = '9A1LACQqjQw1h1MSc6yfxMUpO9nYdWnrBT5L8CI+m6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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