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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673bc986e31dddf9f8adb04ee1a37096a758cf5b82c2da45811dbb57907f9e15' 
  AND token = 'eNZ2Sm11AX3la3LZTtuReU7hT+blbWA5GdZuuWOMdNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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