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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eba34ffdffc54b0bf5bb13e728596d4f8fea7432dec925e85fcaf1617902649' 
  AND token = 'b41hBUKo6Nhiu6N8MIgF3Q0sOY8NfnYv+FpmVyDVXVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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