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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dd346f2cc97a12c6fde9f5de8d2c4052cb3f7eef6db188c3669ede25149bf0' 
  AND token = 'B3z14S1zFuBfNJAzpuhzeJcFTnGWomKBAm9l0btbsYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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