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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c220e177cce5241c47fc893e163aedd01c1c44f20adea725f6f354b7b029b08' 
  AND token = 'ko/GSGJcOj3MELsjExvgSXGCd5qdH6W5l0cDRq9UivM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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