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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc95e1f7bd29aa8e347aaf9e75f0f4ed8c9aa2222871563c18c3c728e416c73b' 
  AND token = 'qyp2Fe02Fo+T9lv2tdgpeEUk9uCLIFsgerOOd+Ci5Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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