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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7613f0ec7f49e1ac90506c5b2a5c4ddecdfffd6911caaf4f9a1fc4d10814b9' 
  AND token = 'yE9foq8o8Cg/RtkiNiX4BgbpavabSkg4+x+5px/yvzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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