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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20ca345cae0bd20147221627d58a74722070ed365064d82d283b003aec88ac8' 
  AND token = 'DGHqg6CKvy4Pl44BVziIQrHUrogx6RSabNm3Su0kQ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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