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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df2e3aa7863e8a096c8cf0e3c2b40a6ae386870f167d753eb574dd2c72c97b2' 
  AND token = '7kSP5GMTJ7Csv5vTghD7KDXKt3/YPB+cY7FjIHjFv5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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