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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a115fe5b1496126bd432fe55ee6bb2cbdae2d449d7643d28e0be7702f0796d' 
  AND token = 'na7duBiDVvs+ryySCokmSdS0CkVp9+E+XM3ePwaUVXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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