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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65df021005cef086fbc6634b5eae399025cf604af7f58d709c5f8f3044282c9e' 
  AND token = '6vgfkdgh3SoMK+WlqjT953nz7c0Y7fAVQ29fIoNb9fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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