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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903b089f796c16d63110cfa532cb2a1c5000d3126d022d3dbe34d10d131689df' 
  AND token = 'YX8ldX7dxziPOmKNTAj6JFTRElEBha49FoX0W2QS3Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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