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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf88e6eac0a8c98876b46d6f2b90a136f7a68dd945bcbd6ae0ef3ca357afdbe' 
  AND token = 'RT7g+71uxw7lhAVWlEjuMSCTsrLoztU+fj3aUIju4wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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