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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a7dc817096ec124f25e7c528b75a1e873a6ea0c765a5e480fdf1c64895eb0a' 
  AND token = 'uKfKHct097SStJpFZCbF9LlVf3esUmwYShhB3Ldboh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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