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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69907cc1aed0af3e9744fdf05e7faf99bb1eaaa2d48213011fc69e49e280a3a7' 
  AND token = 'DrDb4tzqH7l+qlhrIWz6CoU9/pK6yLEo6+JiPy0Q1PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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