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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb5e1cca68e58b310d8ea7fd5f506c802b66fc981dd4de4ef2f0a3f8ba8aa39' 
  AND token = 'O6Chn16ixB0M0rbQQSn/+8bSO61HGOfqG2pcQkel3kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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