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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cab595dda79bce5b1a6e190b69bcd8a13632b9d9d996990862a49918af01efe' 
  AND token = 'PF0T4JIXRLCJPcOI1b6MOWdYcjEu67XNyLdoxnjo284=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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