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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1303d3dae960c784a76e294669276f1426313c0d03ec0dff229c75f19fd2fed3' 
  AND token = '1erAcbascb+1xwg3ChkI5CN/tWuIkEGwZ2j6tGKAfW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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