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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e07080c9f9717495f6b02b5292a067ef91b78d201fe357a4e4c799afcac95e' 
  AND token = 'qTj64qVd31EDLiyTNeU2ZeorP1fwL1NTCnt7AkYr5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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