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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f07ce2b84277a82ed7b71094e570cda45724e6ea4bfd83dd1fedfa3d2ba8007' 
  AND token = 'gvRnmbI+BE4D5Ib7p7UD7wJjdyq/dAGVN56cEc8Ybmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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