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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7525fee2fc1aa519df75837ca55fc5cecf00db89f98854b40466b4c3abadaac' 
  AND token = 'A4HLYIs4ePN4Bj+6oX4pIh+E2fCP0BBrYszIapjt2BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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