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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c27ff91dd8633778494c1380dcdc6ceb456daa48127c031f53e90b19cb8869' 
  AND token = '1dWPxFzbjuz7SO/0dO4QUXUJQR1fpSandYmGvZ3t2nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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