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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86176ce958fcfa897737fd888095fea71ab4b22f70dc02d49eb113b4b952547' 
  AND token = '481WY8lNtl7P9xqDVjaDcwn0AnLr9u797sIJE2YXS/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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