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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7456e1564fe5dbcfb4cc9b8001c1b24f550364abf7d129c844f1e0fb63cfbff4' 
  AND token = 'B66ZXcJtn1D9sxzTEPmpwl7yo/Zyzjbxav9ToXZcTyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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