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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7396b02ead22fdaa682f0b895d22e540617b0b9a15c0608d9a7eb93be0f707f' 
  AND token = 'bAt6drYj5YCDfuc5DYFXbfoMoGjeUkXwGXqHsnTZXbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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