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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f5ed16e8483995dd6bab37a47a23a0868e30769e9231a6cd579c00ecb7df47' 
  AND token = 'v0GK6YzDahfxqTvHTMDimt9XvIXOY3oTl0HBPzIwz1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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