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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c90fcf8f741a54ba2469d4c78389a41289881102107662d01617a15915a282' 
  AND token = '0igsQWl77S0tcwYLKOEmZtpxkbaQCvCpW7pmO8kNWRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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