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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50778dbc0d413e95c0b32ed14320a93b308cde51b1858ed224971cd656e13a45' 
  AND token = 'tYjxp5p4jaPOQEhaGCQst06LVfpXHc8fiOAxfO+DOz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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