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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dd993c9c1eef6e661c71be3a6746303af0372281f67974a9b45e852285f4d9' 
  AND token = 'f9h4zFmNq9wLx1zYKnlegdzvOphHfh1lI9l8WREqBrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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