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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996f9965258e117ece878799c6053f8365cd5e1e3469f6f1a979f2a7c0486649' 
  AND token = 'Rb/9c9+3NQ0A0Lpl7CB4ASHWbK1NmKyJzNayJTChAzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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