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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb97ee06f13e0b2b1b8e1ed4cb160d32689d3e4314610a12fa21742c7257b481' 
  AND token = 't22kLBiwGbrpdrSkGZlhVfYH/9hH2eDFtpUT4agmkVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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