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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857bebe4b7a67e1fa85ae4cea03aba738993b1bbbd3d4d8be41d610f3c0e8f29' 
  AND token = 'WRO4gBbzjLZfF0S2OC2flroQBKhzUMu8UNGT2eEI/jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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