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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb74687684ad9ccfd6259432f582d5f2b6815acd25d6ce4d58cab58aabfd19c' 
  AND token = 'zz9Ux0FNIqzV7jVxgMUo29W1ZlcckNdPWrpfgpFVLM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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