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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8f03615d1a523a4fbec07e715c3ac7b2072dc999eb1232748df5ff0d831ebc' 
  AND token = 'Pfd5BbxqDVtrM0mmXZOYBoGPu548h0LD+8ms8aD6Y0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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