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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbd2cd68b6ae2ea84c2e93100397c6f86c4ea7447188216f03604cc79090438' 
  AND token = 'SPZPwx2tShBebe4MYMEdQq/xTHrYJPXLiLs5creZZA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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