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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c429cd3c253cbcb3e983b2b5097c5c35b7756b0103ccc52ff150dde8e26dc0b6' 
  AND token = '6CED6BoH5xsqfFV3vAahs/lLnRIRJEmzviJkLgGE1rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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