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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf68a4404c8a063f428323af04fb076aca3d60e4e66202f07b8b545f1beb3e0' 
  AND token = 'ngCo8awH9JYg2hg35gmNZXd27dWYydM/GWMDuwDE4m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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