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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b76410cfacba8f7644e1a307ee002ca4d9f031f158c4c9d045b8292816b2d1d' 
  AND token = '7zUC3OrfiXXUM/Y5nub6+Aqc1/xXA1IT2E/Gy401Y9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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