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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb08de38a8e1a9bd7fb54a7d4d4199134ef897c064a61cd67bbdefa492ade1a' 
  AND token = 'BskyR6/FAQhDGuj1ve0Wx5nTfebIXX4ocbt+g3tQGbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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