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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884c5bbc3c330a584c90e8111f42c1c53c058301e202e95921424fdeaee41dcb' 
  AND token = 'P8AGcfkoVe0CXUWmLR4iykpT/uQ5c3tOTT0/O+lfh1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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