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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc561e59a94d16f4b64817036f88a5762c64c7f6a6f998511e5e02b8eed7817c' 
  AND token = '5KlNAcyALE3/arJyoahpu1Se5R12IJqJBszNmwJl1X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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