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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faad1e9476aa593e51556152dd39530e26c3bc11383226fab4df002c1e804780' 
  AND token = 'aTxqKD3XOjJ66wz0bSiFKUd+WMJGFAnvEbWwSy3tFmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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