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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da1daa38625c8a3cb1c19e316c095f61b09877b07e0f452a3895f545ac3d7a9' 
  AND token = 'cNdc/awubkJP7M7ZlKY49E7o5JIouWg0coWGdTeMECw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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