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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6b1e6af445df242e7c1bdb3565a064aff9b4df77a7de65ab17463754e8ea06' 
  AND token = 'YUEFbAe3FcJVTOKOwQ5UigDLfsYqVW4oJz+ybRjZFSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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