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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a060029141b011a9c84dd33d73b66ee7acb2a70c8d8df30b0a82844fe8a52c2' 
  AND token = 'P93JUxfmKacftV/v1GIFEi7zcG7fJ1l0GChj/JQePsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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