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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26afd33a47227dba71a508a91b991d1ec8a5d73c2a34156d021e3ae761c6767' 
  AND token = 'JCUyNgT2zNmqCzFPxvDS8y5c4mO1q0fsl/mXGI1lieY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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