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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5626d398e6fa31b7ccd7817e97297711f8d76e8d5fd62e4a757ac579c30fc4d0' 
  AND token = 'HOyi7FjvkQMp2BD+OSWTRDxTBr9wm0Vzv9MCn5pg3MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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